Tapcos feed fine, the problem comes when you take them off a square range and start running classes, drills, etc. with them. You will quickly find them to be not durable enough for such use. My first carbine class I sheered the rear lug off the mag when dropping to prone, after that I started replacing all my mags with Circle 10s. Worth the cost to me to have the utmost durability in a mag.
Last edited by HWI; 02-08-2013 at 00:36..